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BGA (based on http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, based on this one, Number of facets of rounding cylinder ct = -0.1; // circle translate? Not sure. // // knob_radius_top = 16; // Bottom radius of the indenting cones. ≥30 means "round, using current quality setting". Shafthole_faces = 20; shaft_radius.

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